Note: This page includes content based on the F1 documentation for Centura development. It may be partially converted to support APF development, but should be regarded to be of uncertain actuality. It is provided as is. Eventually, it should be replaced by documentation available from within Visual Studio.
Const.PM_DataSourceClear
The Const.PM_DataSourceClear message is sent to a data source to clear the data source and all detail data sources.
Name | Description |
---|---|
nWhat = wParam | Standard method parameter. Possible values are Const.METHOD_Inquire, Const.METHOD_Execute, Const.METHOD_GetType |
lParam | Unused |
When nWhat = Const.METHOD_Inquire, TRUE is returned if the data source is not empty (already cleared).
When nWhat = Const.METHOD_Execute, FALSE is returned if the user selects Cancel to the question "save changes". Otherwise, TRUE is returned.